Is borosilicate glass better than regular glass for food storage?

Yes for temperature swings. Borosilicate expands less when heated, so it is less likely to crack going from freezer to microwave or oven.

Can these containers go from freezer straight to the oven?

Borosilicate glass tolerates that better than soda-lime glass, but avoid putting a cold dish into a preheated hot oven or onto a hot burner. Let it warm slightly first.

Are the lids leak-proof enough for soup?

The lids are described as leak-proof, but simple press lids tend to seal best when new. For liquids carried in a bag, test the seal first and keep the container upright.

Can the lids go in the microwave or oven?

Keep lids off during oven or microwave heating. Most lids of this type are for storage and are not rated for high heat.

How many containers and sizes are in the 16-piece set?

The set has 16 pieces total, which usually means containers plus matching lids. Check the listing for the split of container sizes before buying.

Is this set worth it over plastic containers?

If you reheat food often and dislike plastic staining or odor, glass is the better long-term pick. If you need light, cheap containers for carrying, plastic still wins on weight.